Hoyt RX-9 Ultra Specs and Mod Chart
The Hoyt RX-9 Ultra (2025) publishes a 340 fps IBO rating, 33.5 in axle to axle, a 6.375 in brace height, a draw length range of 26 to 31 in and 40 to 80 lb of draw weight. The current Ultra, trading brace height for speed against the RX-8: a 6.375 inch brace and a 340 fps rating in a 33.5 inch bow.
Full published specifications for the Hoyt RX-9 Ultra, a 2025 model, along with how its draw length adjusts and who the bow actually suits. Every figure below comes from manufacturer published data, cross-checked against major retailer specification tables where a manufacturer page has been retired.
Hoyt RX-9 Ultra specifications
| Specification | Published value |
|---|---|
| Brand | Hoyt |
| Model | RX-9 Ultra |
| Model year | 2025 |
| IBO / ATA speed rating | 340 fps |
| Axle to axle | 33.5 in |
| Brace height | 6.375 in |
| Draw weight range | 40 to 80 lb |
| Draw length range | 26 to 31 in |
| Let-off | 75%, 80% or 85% |
| Mass weight | 4.3 lb |
| Production status | Current model |
Specifications come from manufacturer published data and are provided for reference. Bows are occasionally revised within a model year and published figures carry manufacturing tolerances, so confirm the exact numbers with a dealer or a pro shop before ordering arrows or accessories.
Draw length modules and how adjustment works
HBX Gen 4 cam with quarter inch draw length adjustments using the applicable modules.
The published range is 26 to 31 in , which is 5 inches of total adjustment. That range is the single most important number on this page, because a bow set outside your correct draw length cannot be tuned into fitting. If the bow is at the extreme end of its range for you, look at a different model rather than living with it.
Three terms get used loosely and mean different things. A rotating module stays on the cam and is unbolted, turned to a new setting, and re-tightened, which you can do at home with a hex wrench. A module swap means buying a different module for the draw length you want, still usually without a press. A cam change means a new cam and a press visit. Check which applies before assuming a used bow will fit you.
Measure your draw length before you shop, not after. The wingspan method is wingspan in inches / 2.5, rounded to the nearest half inch, and our draw length calculator runs it with a sanity check. Have the result confirmed at a shop with your actual release aid, because switching between a wrist strap and a handheld release changes effective draw length by roughly a quarter to a half inch.
What the speed rating really means
The 340 fps figure is an IBO rating, measured at a 30 inch draw length, 70 pounds of draw weight, and a 350 grain arrow. Almost nobody shoots that combination, so treat the number as a way to compare bows against each other rather than as a speed you will see on a chronograph.
As a worked example, a shooter at a 28 inch draw, 60 pounds, with a 425 grain hunting arrow would expect roughly 275 fps from this bow. That estimate applies the standard corrections of about 10 fps per inch of draw under 30, about 2 fps per pound under 70, and about 1 fps per 3 grains of arrow over 350. String accessories such as a peep and a nock set cost a few more. Run your own build through the arrow speed calculator and chronograph it if you need a number you can sight in against.
Who the Hoyt RX-9 Ultra suits
- Hunters who want a long, stable bow that is faster than the previous Ultra.
- Archers who want quarter inch draw length fitting and selectable let-off.
- A long draw variant exists separately, so confirm which version fits your draw length.
Brace height is the quiet forgiveness spec. At 6.375 in, this bow sits at the fast, unforgiving end, which rewards an established anchor and punishes form errors. Axle to axle length works alongside it: see short vs long axle to axle bows for how the two specs interact.
Setting up arrows for this bow
Arrow spine is driven by your draw weight, arrow length, point weight, and cam aggression, not by the bow model alone, so there is no single correct shaft for any bow. Run your actual numbers through the arrow spine calculator and check the result against the spine chart before ordering a dozen shafts. Remember that spine is dynamic: a heavier point or a longer shaft both weaken it.
Safety minimum. At this bow's 80 pound peak weight, total arrow weight must stay at or above 400 grains, which is the industry standard of 5 grains per pound of draw weight. Shooting lighter leaves too much stored energy in the limbs rather than the arrow, which risks damaging the bow and voids most warranties. Build your real total with the total arrow weight calculator, counting shaft, insert, point, nock, wrap, glue, and vanes. Have any setup work you are unsure about checked by a qualified pro shop.
Related reading
- Draw length calculator, the number to settle before you buy any bow
- Arrow spine calculator, cross-manufacturer rather than locked to one shaft brand
- Kinetic energy and momentum calculator
- All bow specs and mod charts
- Gear comparisons
Frequently asked questions
How fast is the Hoyt RX-9 Ultra?
Hoyt rates the RX-9 Ultra at 340 fps IBO. That figure is measured at a 30 inch draw, 70 pounds, and a 350 grain arrow, which is faster than almost anyone actually shoots. Expect roughly 10 fps less for every inch of draw under 30, about 2 fps less per pound under 70, and about 1 fps less for every 3 grains of arrow over 350. A typical hunting setup lands well below the published number.
What is the draw length range on the Hoyt RX-9 Ultra?
The RX-9 Ultra covers 26 to 31 in, a span of 5 inches. HBX Gen 4 cam with quarter inch draw length adjustments using the applicable modules. Measure your own draw length before you shop, because a bow set outside your correct length will never anchor consistently no matter how well the rest of the setup is tuned.
What draw weight does the Hoyt RX-9 Ultra come in?
Published draw weight is 40 to 80 lb. Limb options of 40 to 50, 50 to 60, 55 to 65, 60 to 70, 65 to 75, and 70 to 80 lb. Choose the weight you can draw smoothly while seated and without raising the bow above your head, not the highest number you can muscle once. Overbowing is the most common setup mistake in archery, and it damages form long before it damages anything else.
What is the minimum arrow weight for the Hoyt RX-9 Ultra?
At its 80 pound peak weight, the hard floor is 400 grains total arrow weight, based on the industry minimum of 5 grains per pound of draw weight. Going lighter leaves too much energy in the limbs rather than the arrow, which risks cracking limbs or cams and voids most warranties. Check the bow's own documentation as well, since some manufacturers set a higher minimum.
Is the Hoyt RX-9 Ultra still in production?
Yes, the RX-9 Ultra is listed in Hoyt's current lineup, so new stock and dealer support should be available. Specifications are occasionally revised between model years, so confirm the figures on this page against the spec sheet for the exact bow you are buying.
How we choose: we compare published manufacturer specifications, verified owner reviews, and pro shop guidance. We do not test gear in person. Draw weight and arrow spine affect safety, so follow your bow manufacturer's specifications and have setup work checked by a qualified pro shop.